package texture

import (
	"github.com/hajimehoshi/go-ebiten/graphics"
)

type Texture struct {
	native interface{}
	width  int
	height int
}

func New(native interface{}, width, height int) *Texture {
	return &Texture{native, width, height}
}

func (texture *Texture) u(x int) float32 {
	return float32(x) / float32(graphics.AdjustSizeForTexture(texture.width))
}

func (texture *Texture) v(y int) float32 {
	return float32(y) / float32(graphics.AdjustSizeForTexture(texture.height))
}

type Drawable interface {
	Draw(native interface{}, quads []graphics.TextureQuad)
}

func (texture *Texture) Draw(drawable Drawable) {
	x1 := float32(0)
	x2 := float32(texture.width)
	y1 := float32(0)
	y2 := float32(texture.height)
	u1 := texture.u(0)
	u2 := texture.u(texture.width)
	v1 := texture.v(0)
	v2 := texture.v(texture.height)
	quad := graphics.TextureQuad{x1, x2, y1, y2, u1, u2, v1, v2}
	drawable.Draw(texture.native, []graphics.TextureQuad{quad})
}

func (texture *Texture) DrawParts(parts []graphics.TexturePart, drawable Drawable) {
	quads := []graphics.TextureQuad{}
	for _, part := range parts {
		x1 := float32(part.LocationX)
		x2 := float32(part.LocationX + part.Source.Width)
		y1 := float32(part.LocationY)
		y2 := float32(part.LocationY + part.Source.Height)
		u1 := texture.u(part.Source.X)
		u2 := texture.u(part.Source.X + part.Source.Width)
		v1 := texture.v(part.Source.Y)
		v2 := texture.v(part.Source.Y + part.Source.Height)
		quad := graphics.TextureQuad{x1, x2, y1, y2, u1, u2, v1, v2}
		quads = append(quads, quad)
	}
	drawable.Draw(texture.native, quads)
}

type FramebufferCreator interface {
	Create(native interface{}) interface{}
}

func (texture *Texture) CreateRenderTarget(creator FramebufferCreator) *RenderTarget {
	return NewRenderTarget(creator.Create(texture.native), texture.width, texture.height)
}